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This is not possible to disable. Its likely a feature that is optional, in that, you don't have to actually use it.
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RamhoundSep 18 '12 at 11:42

@Ramhound Ok thanks for the information. It's more like kids on school will try to click it .. So I was looking a way to disable it
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JochemQuerySep 18 '12 at 16:34

Hey thanks for selecting my wrong answer as right ;) Jokes aside: There is a way to disable this. It's done by GPO. You can find the Setting by opening the local group policy editor (start - run - gpedit.msc) and then find the policy under: Computer - Administrative Templates - Windows Components - Credential User Interface - Do not display the password reveal button. I edited my answer.
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LanghardDec 5 '13 at 6:53

1 Answer
1

I think what you mean is the password hint.
Go to System Preferences - User Accounts - Your Account - Change Password.
There are two fields for your password and one for the password hint.
Could it be that you entered your password there, in the hint field?

Cheers

EDIT

Now that we talk about the same thing ;):

You can find the Setting by opening the local group policy editor (start - run - gpedit.msc) and then find the policy under: Computer - Administrative Templates - Windows Components - Credential User Interface - Do not display the password reveal button